httpd-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Robinson Craig" <Craig.Robin...@nrw.qld.gov.au>
Subject [users@httpd] Understanding the APACHE 1.3 process model
Date Fri, 28 Sep 2007 02:39:01 GMT
Hi Folks,

I'm trying to clarify my understanding of the APACHE 1.3 process model
on Solaris UNIX.

As I understand, "Apache 1.3 on UNIX is a pre-forking process per
request server". This means that Apache effectively needs 1 HTTP process
per 1 concurrently connected client. For example, if [StartServers 5] is
set in httpd.conf, Apache starts with 6 HTTPD processes (5 childs + 1
parent). If there were 20 concurrently connected clients, then there
would be 21 HTTPD processes.

Firstly, is this correct understanding?

If so, my next question is thus:

What constitutes a "concurrently connected client"? At a moment in time,
if I run the following netstat command on a Solaris machine:

netstat -P tcp -n | grep ".80 " | grep -v TIME_WAIT | wc -l

I get '45', which is constituted as follows, with the following TCP
statuses:

23 x ESTABLISHED
1  x FIN_WAIT_1
20 x FIN_WAIT_2
1  x LAST_ACK
--
45

However, if I count the number of HTTPD processes at this same point in
time per '/usr/ucb/ps -auxww | grep httpd | wc -l', I get '35'.

Therefore, either my first premise above is wrong...or I am not
measuring the number of 'concurrently connected clients' accurately.

Any enlightenment will be appreciated.

Cheers, Craig

************************************************************************
The information in this email together with any attachments is
intended only for the person or entity to which it is addressed
and may contain confidential and/or privileged material.
Any form of review, disclosure, modification, distribution
and/or publication of this email message is prohibited, unless
as a necessary part of Departmental business.
If you have received this message in error, you are asked to
inform the sender as quickly as possible and delete this message
and any copies of this message from your computer and/or your
computer system network.
************************************************************************


---------------------------------------------------------------------
The official User-To-User support forum of the Apache HTTP Server Project.
See <URL:http://httpd.apache.org/userslist.html> for more info.
To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
   "   from the digest: users-digest-unsubscribe@httpd.apache.org
For additional commands, e-mail: users-help@httpd.apache.org


Mime
View raw message